diff options
Diffstat (limited to 'kernel/arch/powerpc/kvm/book3s_hv_rmhandlers.S')
| -rw-r--r-- | kernel/arch/powerpc/kvm/book3s_hv_rmhandlers.S | 204 |
1 files changed, 167 insertions, 37 deletions
diff --git a/kernel/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/kernel/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 3b2d2c5b6..463af88c9 100644 --- a/kernel/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/kernel/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -128,6 +128,10 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) subf r4, r4, r3 mtspr SPRN_DEC, r4 + /* hwthread_req may have got set by cede or no vcpu, so clear it */ + li r0, 0 + stb r0, HSTATE_HWTHREAD_REQ(r13) + /* * For external and machine check interrupts, we need * to call the Linux handler to process the interrupt. @@ -146,6 +150,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) cmpwi cr1, r12, BOOK3S_INTERRUPT_MACHINE_CHECK cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL beq 11f + cmpwi r12, BOOK3S_INTERRUPT_H_DOORBELL + beq 15f /* Invoke the H_DOORBELL handler */ cmpwi cr2, r12, BOOK3S_INTERRUPT_HMI beq cr2, 14f /* HMI check */ @@ -170,6 +176,10 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) mtspr SPRN_HSRR1, r7 b hmi_exception_after_realmode +15: mtspr SPRN_HSRR0, r8 + mtspr SPRN_HSRR1, r7 + ba 0xe80 + kvmppc_primary_no_guest: /* We handle this much like a ceded vcpu */ /* put the HDEC into the DEC, since HDEC interrupts don't wake us */ @@ -215,7 +225,6 @@ kvm_novcpu_wakeup: ld r5, HSTATE_KVM_VCORE(r13) li r0, 0 stb r0, HSTATE_NAPPING(r13) - stb r0, HSTATE_HWTHREAD_REQ(r13) /* check the wake reason */ bl kvmppc_check_wake_reason @@ -315,33 +324,54 @@ kvm_start_guest: cmpdi r3, 0 bge kvm_no_guest - /* get vcpu pointer, NULL if we have no vcpu to run */ - ld r4,HSTATE_KVM_VCPU(r13) - cmpdi r4,0 - /* if we have no vcpu to run, go back to sleep */ + /* get vcore pointer, NULL if we have nothing to run */ + ld r5,HSTATE_KVM_VCORE(r13) + cmpdi r5,0 + /* if we have no vcore to run, go back to sleep */ beq kvm_no_guest kvm_secondary_got_guest: /* Set HSTATE_DSCR(r13) to something sensible */ - ld r6, PACA_DSCR(r13) + ld r6, PACA_DSCR_DEFAULT(r13) std r6, HSTATE_DSCR(r13) - /* Order load of vcore, ptid etc. after load of vcpu */ + /* On thread 0 of a subcore, set HDEC to max */ + lbz r4, HSTATE_PTID(r13) + cmpwi r4, 0 + bne 63f + lis r6, 0x7fff + ori r6, r6, 0xffff + mtspr SPRN_HDEC, r6 + /* and set per-LPAR registers, if doing dynamic micro-threading */ + ld r6, HSTATE_SPLIT_MODE(r13) + cmpdi r6, 0 + beq 63f + ld r0, KVM_SPLIT_RPR(r6) + mtspr SPRN_RPR, r0 + ld r0, KVM_SPLIT_PMMAR(r6) + mtspr SPRN_PMMAR, r0 + ld r0, KVM_SPLIT_LDBAR(r6) + mtspr SPRN_LDBAR, r0 + isync +63: + /* Order load of vcpu after load of vcore */ lwsync + ld r4, HSTATE_KVM_VCPU(r13) bl kvmppc_hv_entry /* Back from the guest, go back to nap */ - /* Clear our vcpu pointer so we don't come back in early */ + /* Clear our vcpu and vcore pointers so we don't come back in early */ li r0, 0 + std r0, HSTATE_KVM_VCPU(r13) /* - * Once we clear HSTATE_KVM_VCPU(r13), the code in + * Once we clear HSTATE_KVM_VCORE(r13), the code in * kvmppc_run_core() is going to assume that all our vcpu * state is visible in memory. This lwsync makes sure * that that is true. */ lwsync - std r0, HSTATE_KVM_VCPU(r13) + std r0, HSTATE_KVM_VCORE(r13) /* * At this point we have finished executing in the guest. @@ -374,16 +404,71 @@ kvm_no_guest: b power7_wakeup_loss 53: HMT_LOW - ld r4, HSTATE_KVM_VCPU(r13) - cmpdi r4, 0 + ld r5, HSTATE_KVM_VCORE(r13) + cmpdi r5, 0 + bne 60f + ld r3, HSTATE_SPLIT_MODE(r13) + cmpdi r3, 0 + beq kvm_no_guest + lbz r0, KVM_SPLIT_DO_NAP(r3) + cmpwi r0, 0 beq kvm_no_guest HMT_MEDIUM + b kvm_unsplit_nap +60: HMT_MEDIUM b kvm_secondary_got_guest 54: li r0, KVM_HWTHREAD_IN_KVM stb r0, HSTATE_HWTHREAD_STATE(r13) b kvm_no_guest +/* + * Here the primary thread is trying to return the core to + * whole-core mode, so we need to nap. + */ +kvm_unsplit_nap: + /* + * Ensure that secondary doesn't nap when it has + * its vcore pointer set. + */ + sync /* matches smp_mb() before setting split_info.do_nap */ + ld r0, HSTATE_KVM_VCORE(r13) + cmpdi r0, 0 + bne kvm_no_guest + /* clear any pending message */ +BEGIN_FTR_SECTION + lis r6, (PPC_DBELL_SERVER << (63-36))@h + PPC_MSGCLR(6) +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) + /* Set kvm_split_mode.napped[tid] = 1 */ + ld r3, HSTATE_SPLIT_MODE(r13) + li r0, 1 + lhz r4, PACAPACAINDEX(r13) + clrldi r4, r4, 61 /* micro-threading => P8 => 8 threads/core */ + addi r4, r4, KVM_SPLIT_NAPPED + stbx r0, r3, r4 + /* Check the do_nap flag again after setting napped[] */ + sync + lbz r0, KVM_SPLIT_DO_NAP(r3) + cmpwi r0, 0 + beq 57f + li r3, (LPCR_PECEDH | LPCR_PECE0) >> 4 + mfspr r4, SPRN_LPCR + rlwimi r4, r3, 4, (LPCR_PECEDP | LPCR_PECEDH | LPCR_PECE0 | LPCR_PECE1) + mtspr SPRN_LPCR, r4 + isync + std r0, HSTATE_SCRATCH0(r13) + ptesync + ld r0, HSTATE_SCRATCH0(r13) +1: cmpd r0, r0 + bne 1b + nap + b . + +57: li r0, 0 + stbx r0, r3, r4 + b kvm_no_guest + /****************************************************************************** * * * Entry code * @@ -854,7 +939,10 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) cmpwi r0, 0 bne 21f HMT_LOW -20: lbz r0, VCORE_IN_GUEST(r5) +20: lwz r3, VCORE_ENTRY_EXIT(r5) + cmpwi r3, 0x100 + bge no_switch_exit + lbz r0, VCORE_IN_GUEST(r5) cmpwi r0, 0 beq 20b HMT_MEDIUM @@ -870,7 +958,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) blt hdec_soon ld r6, VCPU_CTR(r4) - lwz r7, VCPU_XER(r4) + ld r7, VCPU_XER(r4) mtctr r6 mtxer r7 @@ -985,9 +1073,13 @@ secondary_too_late: #endif 11: b kvmhv_switch_to_host +no_switch_exit: + HMT_MEDIUM + li r12, 0 + b 12f hdec_soon: li r12, BOOK3S_INTERRUPT_HV_DECREMENTER - stw r12, VCPU_TRAP(r4) +12: stw r12, VCPU_TRAP(r4) mr r9, r4 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING addi r3, r4, VCPU_TB_RMEXIT @@ -1103,7 +1195,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) mfctr r3 mfxer r4 std r3, VCPU_CTR(r9) - stw r4, VCPU_XER(r9) + std r4, VCPU_XER(r9) /* If this is a page table miss then see if it's theirs or ours */ cmpwi r12, BOOK3S_INTERRUPT_H_DATA_STORAGE @@ -1171,12 +1263,18 @@ mc_cont: bl kvmhv_accumulate_time #endif + mr r3, r12 /* Increment exit count, poke other threads to exit */ bl kvmhv_commence_exit nop ld r9, HSTATE_KVM_VCPU(r13) lwz r12, VCPU_TRAP(r9) + /* Stop others sending VCPU interrupts to this physical CPU */ + li r0, -1 + stw r0, VCPU_CPU(r9) + stw r0, VCPU_THREAD_CPU(r9) + /* Save guest CTRL register, set runlatch to 1 */ mfspr r6,SPRN_CTRLF stw r6,VCPU_CTRL(r9) @@ -1272,6 +1370,20 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) std r6, VCPU_ACOP(r9) stw r7, VCPU_GUEST_PID(r9) std r8, VCPU_WORT(r9) + /* + * Restore various registers to 0, where non-zero values + * set by the guest could disrupt the host. + */ + li r0, 0 + mtspr SPRN_IAMR, r0 + mtspr SPRN_CIABR, r0 + mtspr SPRN_DAWRX, r0 + mtspr SPRN_TCSCR, r0 + mtspr SPRN_WORT, r0 + /* Set MMCRS to 1<<31 to freeze and disable the SPMC counters */ + li r0, 1 + sldi r0, r0, 31 + mtspr SPRN_MMCRS, r0 8: /* Save and reset AMR and UAMOR before turning on the MMU */ @@ -1541,12 +1653,17 @@ kvmhv_switch_to_host: /* Primary thread waits for all the secondaries to exit guest */ 15: lwz r3,VCORE_ENTRY_EXIT(r5) - srwi r0,r3,8 + rlwinm r0,r3,32-8,0xff clrldi r3,r3,56 cmpw r3,r0 bne 15b isync + /* Did we actually switch to the guest at all? */ + lbz r6, VCORE_IN_GUEST(r5) + cmpwi r6, 0 + beq 19f + /* Primary thread switches back to host partition */ ld r6,KVM_HOST_SDR1(r4) lwz r7,KVM_HOST_LPID(r4) @@ -1590,7 +1707,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) 18: /* Signal secondary CPUs to continue */ stb r0,VCORE_IN_GUEST(r5) - lis r8,0x7fff /* MAX_INT@h */ +19: lis r8,0x7fff /* MAX_INT@h */ mtspr SPRN_HDEC,r8 16: ld r8,KVM_HOST_LPCR(r4) @@ -1646,7 +1763,8 @@ kvmppc_hdsi: beq 3f clrrdi r0, r4, 28 PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */ - bne 1f /* if no SLB entry found */ + li r0, BOOK3S_INTERRUPT_DATA_SEGMENT + bne 7f /* if no SLB entry found */ 4: std r4, VCPU_FAULT_DAR(r9) stw r6, VCPU_FAULT_DSISR(r9) @@ -1665,18 +1783,19 @@ kvmppc_hdsi: cmpdi r3, -2 /* MMIO emulation; need instr word */ beq 2f - /* Synthesize a DSI for the guest */ + /* Synthesize a DSI (or DSegI) for the guest */ ld r4, VCPU_FAULT_DAR(r9) mr r6, r3 -1: mtspr SPRN_DAR, r4 +1: li r0, BOOK3S_INTERRUPT_DATA_STORAGE mtspr SPRN_DSISR, r6 +7: mtspr SPRN_DAR, r4 mtspr SPRN_SRR0, r10 mtspr SPRN_SRR1, r11 - li r10, BOOK3S_INTERRUPT_DATA_STORAGE + mr r10, r0 bl kvmppc_msr_interrupt fast_interrupt_c_return: 6: ld r7, VCPU_CTR(r9) - lwz r8, VCPU_XER(r9) + ld r8, VCPU_XER(r9) mtctr r7 mtxer r8 mr r4, r9 @@ -1720,7 +1839,8 @@ kvmppc_hisi: beq 3f clrrdi r0, r10, 28 PPC_SLBFEE_DOT(R5, R0) /* if so, look up SLB */ - bne 1f /* if no SLB entry found */ + li r0, BOOK3S_INTERRUPT_INST_SEGMENT + bne 7f /* if no SLB entry found */ 4: /* Search the hash table. */ mr r3, r9 /* vcpu pointer */ @@ -1737,11 +1857,12 @@ kvmppc_hisi: cmpdi r3, -1 /* handle in kernel mode */ beq guest_exit_cont - /* Synthesize an ISI for the guest */ + /* Synthesize an ISI (or ISegI) for the guest */ mr r11, r3 -1: mtspr SPRN_SRR0, r10 +1: li r0, BOOK3S_INTERRUPT_INST_STORAGE +7: mtspr SPRN_SRR0, r10 mtspr SPRN_SRR1, r11 - li r10, BOOK3S_INTERRUPT_INST_STORAGE + mr r10, r0 bl kvmppc_msr_interrupt b fast_interrupt_c_return @@ -1817,8 +1938,8 @@ hcall_real_table: .long DOTSYM(kvmppc_h_remove) - hcall_real_table .long DOTSYM(kvmppc_h_enter) - hcall_real_table .long DOTSYM(kvmppc_h_read) - hcall_real_table - .long 0 /* 0x10 - H_CLEAR_MOD */ - .long 0 /* 0x14 - H_CLEAR_REF */ + .long DOTSYM(kvmppc_h_clear_mod) - hcall_real_table + .long DOTSYM(kvmppc_h_clear_ref) - hcall_real_table .long DOTSYM(kvmppc_h_protect) - hcall_real_table .long DOTSYM(kvmppc_h_get_tce) - hcall_real_table .long DOTSYM(kvmppc_h_put_tce) - hcall_real_table @@ -2046,7 +2167,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) /* Emulate H_SET_DABR/X on P8 for the sake of compat mode guests */ 2: rlwimi r5, r4, 5, DAWRX_DR | DAWRX_DW - rlwimi r5, r4, 1, DAWRX_WT + rlwimi r5, r4, 2, DAWRX_WT clrrdi r4, r4, 3 std r4, VCPU_DAWR(r3) std r5, VCPU_DAWRX(r3) @@ -2280,7 +2401,6 @@ machine_check_realmode: mr r3, r9 /* get vcpu pointer */ bl kvmppc_realmode_machine_check nop - cmpdi r3, 0 /* Did we handle MCE ? */ ld r9, HSTATE_KVM_VCPU(r13) li r12, BOOK3S_INTERRUPT_MACHINE_CHECK /* @@ -2293,13 +2413,18 @@ machine_check_realmode: * The old code used to return to host for unhandled errors which * was causing guest to hang with soft lockups inside guest and * makes it difficult to recover guest instance. + * + * if we receive machine check with MSR(RI=0) then deliver it to + * guest as machine check causing guest to crash. */ - ld r10, VCPU_PC(r9) ld r11, VCPU_MSR(r9) + andi. r10, r11, MSR_RI /* check for unrecoverable exception */ + beq 1f /* Deliver a machine check to guest */ + ld r10, VCPU_PC(r9) + cmpdi r3, 0 /* Did we handle MCE ? */ bne 2f /* Continue guest execution. */ /* If not, deliver a machine check. SRR0/1 are already set */ - li r10, BOOK3S_INTERRUPT_MACHINE_CHECK - ld r11, VCPU_MSR(r9) +1: li r10, BOOK3S_INTERRUPT_MACHINE_CHECK bl kvmppc_msr_interrupt 2: b fast_interrupt_c_return @@ -2339,14 +2464,19 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) /* hypervisor doorbell */ 3: li r12, BOOK3S_INTERRUPT_H_DOORBELL + + /* + * Clear the doorbell as we will invoke the handler + * explicitly in the guest exit path. + */ + lis r6, (PPC_DBELL_SERVER << (63-36))@h + PPC_MSGCLR(6) /* see if it's a host IPI */ li r3, 1 lbz r0, HSTATE_HOST_IPI(r13) cmpwi r0, 0 bnelr - /* if not, clear it and return -1 */ - lis r6, (PPC_DBELL_SERVER << (63-36))@h - PPC_MSGCLR(6) + /* if not, return -1 */ li r3, -1 blr |